Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Cosmology and astronomy: Cepheid variables 1
Cepheid Variables 1 Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the b…
VideoFree9 minutes
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Cosmology and astronomy: Refraction of seismic waves
Refraction of Seismic Waves Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn abo…
VideoFree9 minutes
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Biology: Peptide bond formation
How amino acids form peptide bonds (peptide linkages) through a condensation reaction (dehydration synthesis). Biology Life is beautiful! F…
VideoFree8 minutes
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High school biology: Organelles in eukaryotic cells
Overview of the nucleus, endoplasmic reticulum, Golgi bodies, vacuoles, mitochondria, chloroplasts and lysosomes. High school biology Eukar…
VideoFree10
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Chemistry: Van der Waals forces
Van der Waals forces: London dispersion forces, dipole-dipole forces, and hydrogen bonding. Chemistry Did you know that everything is made …
VideoFree12 minutes
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Chemistry: Buffers and Henderson-Hasselbalch
Getting an intuitive understanding of buffers using le Chatelier's principle. Derivation of the Henderson-Hasselbalch equation. Chemistry D…
VideoFree15 minutes
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High school biology: Meet the gastrointestinal tract!
High school biology The digestive and excretory systems Topic: Science Learn about all the sciences, from physics, chemistry and biology, t…
VideoFree5 minutes
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Biology: Overview of glycolysis
Overview of the basics of glycolysis. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystem…
VideoFree14 minutes
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Cosmology and astronomy: Correction calendar notation
Correcting the time difference calculation by taking into account that there is no year 0 Cosmology and astronomy It's a great, big univers…
VideoFree4 minutes
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Cosmology and astronomy: Becoming a red giant
Becoming a Red Giant Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn about the …
VideoFree12 minutes
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Biology: K-Ar dating calculation
Working through a calculation for K-Ar dating (good to have some prior experience with e and logarithms) Biology Life is beautiful! From at…
VideoFree11 minutes
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Biology: Myosin and actin
How myosin and actin interact to produce mechanical force. Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…
VideoFree10 minutes
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Biology: Viruses
Introduction to viruses. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is…
VideoFree23 minutes
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Cosmology and astronomy: What causes precession and other orbital changes
What causes precession and other orbital changes Cosmology and astronomy It's a great, big universe out there. In this section of Khan Acad…
VideoFree2 minutes
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Biology: Lac operon
Overview of gene regulation in the Lac operon. Discussion of CAP, cAMP, lac repressor and allolactose in regulation of lac operon. Biology …
VideoFree11 minutes